Looks like Kim Kardashian and Kris Humphries are expanding their family before getting married -- by adding a puppy to the mix!

The two put on a united front amid rumors Kim cheated on Kris with Bret Lockett -- rumors she's planning to sue over -- by stepping out together this weekend together at Petco.

Adorable puppy in hand, Kim and Kris stopped by the pet supply store to pick up some travel crates.

While they haven't officially announced their addition yet, the two tweeted about the dog last week -- Kim saying "I miss my hump @KrisHumphries! Can't wait for u to come home & bring the babies with u! This will be fun!!!! *wink wink* Petco here we come!"

Check out the puppy pics above!

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